Rat control and mouse control are planned as two separate jobs, even though they get talked about together as rodent control. Rats are wary of anything new in their surroundings, range widely, and almost always arrive along a route from outside, so the work concentrates on the perimeter, the harbourage and the way in. Mice are inquisitive, live their whole lives within a few metres, and nest indoors in several small nests at once, so the work is a dense grid inside the building.
Identifying which one you have is therefore the first and most important step, because a treatment designed for the wrong species does not just work more slowly, it fails in a specific and predictable way. Bait laid out for rats in the pattern you would use for mice gets ignored for a fortnight. A couple of traps set for mice in the way you would set them for rats misses most of the population entirely. Everything below is how the two jobs differ in practice, and what that means for a property in Kent.
Two species, two different jobs
The differences that matter on site are behavioural rather than a question of size.
Rats are wary of new objects, so bait and traps are avoided for days before being accepted. They range widely, often 50 metres or more, commuting between harbourage and food, and usually nest outside in banks, decking voids, drains and outbuildings. They feed heavily at a small number of points, need a gap of about 20mm and will gnaw a smaller one bigger, and leave tapered droppings of 15 to 20mm along a route.
Mice are the opposite on almost every count. They are inquisitive and investigate new objects quickly, often within hours. They range only a few metres from the nest for their whole lives and nest indoors, in cavities, under floors and inside appliances. They nibble at many points rather than feeding at one, need a gap of only about 6mm, roughly a pencil width, and leave numerous 3 to 6mm droppings scattered widely.
Read those two together and the shape of each job follows on its own. Rats are a route problem, so you work outwards from the building. Mice are a density problem, so you work inwards. Both sit under the same rodent control service in Kent, but they are surveyed, quoted and planned separately.
Caution and curiosity change the timeline
The wariness rats show towards anything unfamiliar, which the trade calls neophobia, is the single most misunderstood thing about rat control. A rat will notice a new bait station in its territory and avoid it, sometimes for a week, before it will investigate. That is normal and expected, and it is why a homeowner who puts bait down on Saturday and sees nothing touched by Monday usually concludes the product does not work and throws it away, at exactly the point it was about to start being accepted.
In our experience, pre baiting a rat job with unset traps and untreated bait works better than setting everything live on day one because the rats accept the stations while nothing has ever gone wrong at them. Set live immediately and you get one or two early catches, then the survivors associate the station with danger and shun it for weeks, which turns a two visit job into a month of visits.
Mice behave the opposite way and will investigate a new trap almost straight away, so a mouse job can move quickly. The limiting factor with mice is not acceptance but coverage, because they only travel a few metres and a trap outside that radius may as well not exist. That is why a professional mouse treatment uses many points close together rather than a few placed where the droppings were most obvious.
Range decides where the work happens
Because rats commute, a rat job that only treats indoors is treating the symptom. The harbourage is usually outside, in a bank, under decking or a shed, in an overgrown boundary, in a drain run, or in a log or feed store, and until that is dealt with the property simply refills. Drainage defects are worth checking properly on a rat job, since a broken or unsealed drain is both a highway and a home.
Mice are the reverse. The nest is nearly always inside the building, often within a couple of metres of the activity, and there are usually several. Finding and treating the nesting sites, rather than the places droppings were spotted, is what stops the problem returning, and it is the main reason mice come back after a treatment that appeared to work.
What a rat job usually looks like around here
Much of Romney Marsh is reclaimed land drained by a network of dykes, sewers and watercourses, and those banks function as a ready made travel network for rats. From working with clients in Dymchurch, New Romney and Lydd, the pattern is consistent. The rats come along the dyke bank, settle in outbuildings, decking voids and log stores, and only push into the house later when the weather turns. The house itself is often perfectly well maintained, which is why a purely indoor treatment there disappoints so reliably.
On the farmland edge around Ashford, Canterbury and the Weald villages there is a predictable autumn push instead, as harvest and ploughing strip cover and food out of the fields at the same time and rodents move towards buildings. Rat calls climb from autumn every year for that reason.
Proofing on the coast needs its own thought. Salt laden wind along the Dymchurch, Hythe, Folkestone and Dover seafront attacks mortar and any bare steel fixing, so we proof exposed elevations in stainless rather than standard galvanised. Galvanised mesh on a seafront elevation can be failing within a few winters, which quietly reopens the entry point you paid to close.
What a mouse job usually looks like around here
The older terraces in Folkestone and Hythe have suspended timber floors over subfloor voids that connect between properties, so mice travel the length of a row and surface anywhere along it. Scratching carries under the floor, which is why a resident often reports noise in a room with no droppings in it.
We've found that treating a single flat or a single house in one of those terraces rarely holds, because the population is using the shared void and simply moves along. Where we can get agreement from the neighbours to treat two or three properties together, or from a freeholder to treat the whole building, the result is far more durable. That is a conversation worth having early rather than after the second failed attempt.
Resistance is the other thing worth knowing about mice. Populations resistant to some traditional rodenticides are well documented, and the British Pest Control Association's guidance on house mice covers the point. It is one of several reasons professional treatment tends to succeed where a supermarket product has not.
Proofing is the half that lasts
Whichever species it is, treatment removes the current population and proofing decides whether you have another one. The gaps are different sizes, so the work is different. For mice, anything above about 6mm is a way in, which includes worn door thresholds, service entries around pipes and cables, gaps behind kitchen units and airbricks with damaged mesh. For rats, the focus is larger openings, damaged airbricks, defective drains, gaps at the wall head and the points where an extension meets the original building.
Sensible habits do a lot of the remaining work, and the practical steps for keeping rodents out in the first place are largely about food, water and cover rather than anything technical.
Getting it dealt with
We have been carrying out rodent control across South East Kent since 2008, with more than twenty years in the trade behind it, covering Ashford, Canterbury, Folkestone, Hythe, Dover, Deal, New Romney, Dungeness, Tenterden, Ramsgate and the whole of Romney Marsh. We work on domestic, commercial and industrial sites, with a 24 hour emergency response and same day attendance on urgent jobs.
A survey identifies the species first, then maps the runs, the harbourage and the entry points, and the treatment and the proofing are quoted together because doing one without the other only resets the clock. If you are not certain which species you have, that is a perfectly normal starting point and it is the first thing we work out. Get in touch and we will come and take a look.
Cinque Ports Pest Control Ltd is a family run business based in Dymchurch, Romney Marsh. We are BPCA members, Kent County Council Trading Standards approved, TrustMark registered, SafeContractor approved and CRRU supporters.
